buildconf: exec autoreconf to avoid additional process

Also make buildconf exit with the return code of autoreconf.

Reviewed-by: Daniel Stenberg
Follow up to #5853
Closes #5890

diff --git a/buildconf b/buildconf
index 4d342152212756f59db1dc9915ef6bd94f1e8d2c..4e4c17e99919804a34846ed212e25445355afd06 100755 (executable)
--- a/buildconf
+++ b/buildconf
@@ -1,4 +1,4 @@
 #!/bin/sh
 
 echo "*** Do not use buildconf. Instead, just use: autoreconf -fi" >&2
-${AUTORECONF:-autoreconf} -fi "${@}"
+exec ${AUTORECONF:-autoreconf} -fi "${@}"